What is the tested strength requirement for a new fabric if the original Grade A Cotton covering has a breaking strength of 80 pounds?

In aircraft fabric covering, it's crucial that any new fabric meets specific strength requirements to ensure safety and performance. When considering the replacement of an original Grade A Cotton covering, which has a breaking strength of 80 pounds, the new fabric should be tested to a standard that ensures it can withstand similar or greater stresses.

For a replacement fabric to be deemed adequate, it typically needs to maintain a certain percentage of the original fabric's breaking strength. In many cases, this is established around 70%, which would indicate a required strength of about 56 pounds. Therefore, this figure ensures that the new fabric will perform effectively in the same conditions as the original, contributing to the overall safety and integrity of the aircraft.

Selecting this requirement emphasizes the need for reliability in aircraft coverings, ensuring they can perform under operational stress just as effectively as the original materials.